86 Suspension Explanation Suspension
Citroen XM Internet Reference Version 1.0 129
3/3/99
the prevailing driving conditions, all sensor values are continuously
compared with pre-programmed thresholds (which are adjusted in proportion to
road speed). Normally the ECU maintains the electro-valves in the ON state
and so the suspension operates in the SOFT mode. However, when a sensor
value exceeds its threshold, the microprocessors make a decision to switch
the suspension to the FIRM state and the electro-valves are de-energized.
This process occurs very quickly (less than 2 ms).
Once the sensor value drops below its threshold, and after a pre-set time
delay, the suspension is returned to the SOFT setting.
When the driver moves the SPORT control switch to the SPORT position, the
ECU lowers the signal value thresholds by 33%. Thus the suspension system
still switches between SOFT and FIRM modes, but it switches to FIRM far more
readily.
[Image]
I am indebted to Eric Chowanietz the author of Automobile Electronics from
whose book this section has been lifted without permission.
If you are interested in vehicle electronics then this is the book to get!
ISBN 0-7506-1878-7
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